HOSE AS 2464561 - Caterpillar

Illustration 1 g01431372
Hydraulic schematic for the steering system (1) Steering cylinder (2) Steering cylinder (3) Steering cylinder crossover relief valve (4) Steering cylinder crossover relief valve (5) Brake release cylinder (6) Brake release cylinder pressure tap (7) Steering control valve (8) Steering release diverter valve (9) STIC steering pilot valve (10) Check valve (11) Line to parking brakes (12) Secondary steering diverter valve (13) Secondary steering pump (14) Brake release sequence valve (15) Steering system pressure tap (16) Spool (17) Implement and steering solenoid valve (18) Selector and pressure control valve (19) Parking brake control valve (20) Line from implement lift circuit (21) Check valve (22) Hydraulic oil cooler (23) Secondary steering flow switch (24) Primary steering flow switch (25) Steering neutralizer valve for a right turn (26) Check valve (27) Pilot oil pressure tap (28) Check valve (29) Steering neutralizer valve for a left turn (30) Check valve (31) Line to parking brakes (32) Steering pump (33) Steering dual pilot check valve (34) Breaker relief valve (35) Pilot oil pressure reducing valve (36) Portable hydraulic pump quick connect coupler (37) Hydraulic tank (38) Pilot and Braking pump (39) Hydraulic filters (40) Portable hydraulic pump quick connect coupler (41) Line to brake accumulator charging valveNote: Illustration 1 shows a machine with the secondary steering system. Machines without the secondary steering system will not have secondary steering pump (13), secondary steering diverter valve (12), secondary steering flow switch (23) and primary steering flow switch (24) .The high pressure circuit provides the high pressure oil for steering cylinder (1) and steering cylinder (2) .With the engine running, oil is drawn from hydraulic tank (37) by steering pump (32). Steering pump (32) supplies oil to steering control valve (7). Oil supplied to steering control valve (7) flows through spool (16) .When pilot oil moves spool (16) the oil from steering pump (31) is directed to steering cylinder (1) and steering cylinder (2). When a right turn is made, the oil flows to the rod end of steering cylinder (2) and to the head end of cylinder (1). When a left turn is made, the oil flows to the head end of steering cylinder (2) and the rod end of cylinder (1) .When a turn is made oil displaced from steering cylinder (1) and steering cylinder (2) returns through spool (16) and steering control valve (7) to hydraulic oil cooler (22). The return oil flows through hydraulic oil cooler (22) and hydraulic filters (39) to hydraulic tank (37) .Hydraulic oil cooler (22) has a bypass orifice. If the oil is cold or if oil cooler (22) is blocked, the oil will flow through the bypass orifice and return to hydraulic tank (37) .Steering cylinder crossover relief valves (3) and (4) prevent excessive pressure in steering cylinder (1) and steering cylinder (2). The pressure could develop if one of the tires hits an object.